must flat
Regular verb: flat - flated- flated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flat
you must flat
he must flat
we must flat
you must flat
they must flat 	I must be flating
you must be flating
he must be flating
we must be flating
you must be flating
they must be flating	I must have flated
you must have flated
he must have flated
we must have flated
you must have flated
they must have flated	I must have been flating
you must have been flating
he must have been flating
we must have been flating
you must have been flating
they must have been flating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not flat
you must not flat
he must not flat
we must not flat
you must not flat
they must not flat 	I must not be flating
you must not be flating
he must not be flating
we must not be flating
you must not be flating
they must not be flating	I must not have flated
you must not have flated
he must not have flated
we must not have flated
you must not have flated
they must not have flated	I must not have been flating
you must not have been flating
he must not have been flating
we must not have been flating
you must not have been flating
they must not have been flating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flat?
must you flat?
must he flat?
must we flat?
must you flat?
must they flat? 	must I be flating?
must you be flating?
must he be flating?
must we be flating?
must you be flating?
must they be flating? 	must I have flated?
must you have flated?
must he have flated?
must we have flated?
must you have flated?
must they have flated? 	must I have been flating?
must you have been flating?
must he have been flating?
must we have been flating?
must you have been flating?
must they have been flating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not flat?
must you not flat?
must he not flat?
must we not flat?
must you not flat?
must they not flat? 	must I not be flating?
must you not be flating?
must he not be flating?
must we not be flating?
must you not be flating?
must they not be flating? 	must I not have flated?
must you not have flated?
must he not have flated?
must we not have flated?
must you not have flated?
must they not have flated? 	must I not have been flating?
must you not have been flating?
must he not have been flating?
must we not have been flating?
must you not have been flating?
must they not have been flating?